Test-clamp.



No. 812,557. PATENTED FEB. 13, 1906.

' T. NAGEL.

TEST CLAMP.

APPLIOATIOH FILED DEO.19, 1904.

' UNIT D STATES PATENT oFrroE.

THEODORE NAGEL, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF 'IO LATHROP H. COLLINS, OF CHICAGO, ILLINOIS.

TEST-CLAM P.

Patented Feb. 13, 1906.

Applic ation filed Debemher 19, 1904. Serial No. 237,487-

To all whom it} may concern.-

Be it known that I, THEODORE NAGEL, a citizen of the United States, and a resident of Chicago, in'the county of Cook and State of Illinois, have invented certain new and useful Im rovements in Test-Clamps, of which the fol owing is a full, clear, and exact description.

My invention relates to what is known as test-clamps, which are used extensively by electricians, especially in telephone-circuits, for clamping wires or ends of Wires together.

Wires of different sizes or diameters are used particularly in telephone work,and it is oftentimes difiicult with the means at present available for that urpose to clamp them together, and even w ere this can be satisfactorily accomplished when the clamp is loosened it will fall off of the wire.

The object of my invention is to provide a simple and effective clamping device for securing the ends of two or more wires of the same or different diameters together which will not accidentally fall off of the wires when it is loosened to permit the withdrawal of the same. This I accomplish b the means hereinafter fully described, an as particularly pointed out in the claims.-

In the drawings, Figure 1 is a perspective view. of my invention, drawn to an enlarged scale and showingFportions of severalwires secured therein. 1g. 2 is an end view thereof. Fig. 3 is a transverse section vtaken through the centerof length of the clamp. Fig. 4 is a similar view of a modified construction of my invention. Fig. 5 is a lan view of the outer clamping-plate thereo Fig. 6 is a perspective view of the innermost clampin -Flate.

y invention comprises a holder A, which consists of a short channel-shaped piece of metal, clamping-plates B and C, respectively,

and a eculiarlyrconstructed clam ing-screw D. T ese clam inglates are 0 the same length, but of si ht y less width than the channel of the hol er A, and are of such thickness that when wires of the largest ga e are clamped by the same the uppermost p ate B will not have its outer or ex osed surface raised above the edges of the si e walls of the k holder. .The lower plate has the lower angles of its side edges undercut or beveled; so that when wires are laid lengthwise in the an gles of the channel of the holder it will crowd tion I have provided screw, substantially as' shown.

and clamp said wires into said angles orcorners as it is pushed downward toward the bottom of the holder. The up er surface of the plate O is preferably provi ed with longitudinal grooves arranged one on one side and the other on the other side of the plane of the clampin -screw and are adapted to seat therein t e wires 0 0, either of the same or different diameters than the wires 1) b, hereinbefore referred to. The screw D extends down through enlarged o enings as :1; in the center of the plates B an O and is tapped into the bottom of the holder A, and in order that either one or both of the plates B and C may have a slight tilting movement in any directhe shoulders of the head of the screw D with a convexed bearingboss (1, the curvature of which substantial y corresponds to the circumference of a sphere whose center is intersected by the axis of the This bear.- ing-bossis seated in the countersunk edges e of the adjacent end of the enlarged opening a:

' of the plate B, which forms the bearing-cup therefor, and when the screw is turned so as to cause the lates to clamp one or both of said plates W1 1 tilt,- so as to automatically accommodate their position to and equalize the ressure u on wires of different gage clamped etween t em, substantially as shown in the drawings. p

If desired, the depth of the holder may be increased substantially as shown by the holder E inFig. 4, and instead of two plates three (,2 g h) or more may be used. In this event t e intermediate plate q corresponds in dimensions'to the outermost plate f, except that it has longitudinal grooves k 7.: in its upper surface the same as in the lower plate It and exce in -cup t erem.

hat I claim as new is 1. A. clam comprising a suitable holder, a screw tappe into said holder, two clampingplates each having enlarged openings through which said screw extends whereb they are adapted to be tilted independent y of each other and said screw.

2. A clamp comprising a suitable holder, a screw tapped into said holder, two clampingplates each having enlarged openings through which said screw extends, whereby they are adapted to be tilted independently of each other and said screw and one of said plates 4o mg its side edges adjacent thereto beveled or having longitudinal grooves in the surface opposed to the otherpl'at'e.

I shapedcholder, :tWO clampinggular channel-shaped holder, a screw 3. A clam comprising a suitable rectangular channe -sha'ped holder, a screw tap ed mto said-holder, and a-flat clampingate having an enlarged opening therein the edges of which are concentric with, said screw through which said screw extends and said plate. adapted to be tilted independently of said screw.

4. ,A. clamp comprising a suitable channela screw tapped into said holder, plates each having enlarged openings through which. said screw extends, whereby they are adapted to'b'e tilted independentl of each other .and said screw. 5. Ac amp comprising a suitable channelshaped holder, 'a screw tapped into said holder, two clamping plateseach having enlarged openings through which said screw extends, whereby they are adapted to be tilted independently of each other and said screw, and one of said plates having longitudinal grooves in the surface opposed to theoth'er late.

6. A clamp comprising a suitab e rectantap ed into said holder, and a flat clampin -p ate having an enlarged opening therein the edges of which are concentric with said screw through which said screweXtends-which has its side edges'nearest said holder beveled, and said plate ada'ptedto be tilted independently of said screw. I

- 7. A clamp comprising a suitable channelshaped holder,a screw tapp dinto said holder, two clamping-plates eac having enlarged .o enings through which said screw extends, 'wdiereby'they are adapted .to be tilted independently-of each other, and said screw, the

plate engaging the bottom of said holder havundercut. v

8. A clamp comprising a suitable channelshapedholder, a screw tapped into said holder, two clamping-plates each having enlarged o enings through which said screw extends, whereby the are adapted to be tilted independentl 01 each other and said screw, one of said has having longitudinal grooves in the su ace opposed to the other plate, and the one engaging the bottom of said holder havin its S1d6 edges undercut. 9. i clamp comprising a suitable rectangular holder, 'a screw tapped into saidholder, and a flat clamping-plate'havin an enlarged openingther'ein the edges of w 'ch'a're concentric with said screw through which said screw extendsand with whichit has a swiveled engagement and said plate adapted to be tilte independently of said screw; 10. A'clamp comprisin a suitable holder, a

' screw tap 'ed into said ho der, two clamping plates eac having enla openingsthrough whichsaids'crew exten s, one ofsald plates having a swiveled engagement with said screw tap ed into said he one of said in the surface opposed to the other two. clamping-plates eac screw whereby both are adapted to be tilted .mdependently of each other and said screw.

11. Acla'mp comprisin a suitable holder, a

der, .two clampingplates eac having enlar ed openings through which said screw extends, one of said plates having a swiveled engagement, with said screw whereby both are adapted to be tilted independently of each other and said screw, plates having longitudinallg'rooves ate. 12. A clampcomprising a suitabibrectang'ular channel-shaped 'holder, a screw tap ed into said holder, and a" flatclamping-piate having an enlarged opening therein the edges of which are concentric with. said screw through which said screw extends and with which it has a swiveled engagement, and said.

plate adapted to be tilted independently of said screw.

13. Aclamp comprising a suitable channelshaped holder, a screw tap ed into said holder, two clampingplates eac having enlarged openings through which said screw extends, one of said plates having a swiveled engagement with said screw whereby both are other and said screw.

14 .A clamp comprising asuitable channel shaped holder, a screw tapped into said holder, two clampingplates each having enlarged openings through which said screw extends,

adapted to be tilted independently of each said plates having a swiveled engagement with said screw whereb both are adaptedto be tilted independent y of each other and said screw.,' l j 15. A clamp corhprisin a suitable rectanlar channel-shaped hol er, a

screw tap ed a into said holder, and a fiat clamping-p ate having an enlarged opening therein the edges of which are concentric with said screw through which said screw extends, which has a swiveled engagement with has its side edges nearest said holder beveled,

ently of. said screw.

and said plate adapted to be tilted independf-v said screw and 16. A clamp comprisinga suitable channeli shaped holder, a screw tap ed into saidholder,

openings through which said screw extends, one of said plateshaving a ment withsaid screw whereb both area having enlarged swiveled engageed to be tilted independent y of-each ot er, Y

and said screw, the plate engaging the bottom of said holder having its si e edges adjacentthereto beveled. orundercut. 17. A clamp comprisingasuitable channelshap'ed holder, a screw tan ed into said-holder two clam ing-p'lates eac having enlarged openings t "ough which said screw? extends, one of said ment with said screw whereby both: are adapted to be tilted other and said screw,

ing longitudinal grooves in the. surface op+ plates swing a swiveled engageindependentl ofea'ch I one of said p ates havposed to the other plate, and the one enga ing the bottom of said holder having its si e edges undercut.

18. A clamp comprising a suitable rectangular holder, a screw having a convexed bearing-boss adjacent to the head thereof, and a flat clamping-plate having an enlarged opening throu h which said screw extends the edges of which engaged by said boss are countersunk. 4

19. A clamp comprising a suitable holder, a screw tapped into said holder and having a bearing-boss adjacent to the head thereof, two clamping-plates each having enlarged openings through which said screw extends whereby they are adapted to be tilted inde pendently of each other and said screw, and the plate which is engaged by said boss having a countersunk seat therefor concentric with its opening.

20. A clamp comprising a suitable channelshaped holder, a screw tapped into said holder and having a bearing-boss adjacent to the head thereof, two clamping-plates each having enlarged openings throu h which said screw extends, one of said p ates having a swiv'eled engagement with said screw wherebyboth are adapted to be tilted independently of each other and said screw, one of said I plates having longitudinal grooves in the surface opposed to the other late, and the one engaging the bottom of sai holder ha its side ed es undercut, and the plate whic is engage by said boss having a countersunk seat therefor concentric with its opening.

21. Aclamp compris' shaped holder, a screw avin bearing-boss adjacent to the ead thereof, and a clampin -plate having an enlarged o ening throu which said screw extends t e edges of which engaged by said boss are countersunk.

22. A clamp comprisin a suitable rectanular channel-shaped hol er, a screw tapped lnto said holder and havin a bearin -boss adjacent to the head thereo two flat 0 ampingplates each having enlarged openings through which said screw extends whereby they are adapted to be tilted independently of each other and said screw, and the plate which is enga ed by said boss having a countersunk seat t erefor concentric with its open- %n testimony whereof I have hereunto set my hand this 16th day of December, A. D.

THEODORE NAGEL.

Witnesses:

FRANK D. THOMASON, E. K. LUNDY.

a suitable channel-- a convexed 

